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Table 3: Pearson correlation coefficients (P values) for demographic and neuropsychological measures
Age Duration EDSS Flanker Stroop
Age 1 
Duration 0.36 (.06) 1 
EDSS^{^a} 0.30 (.11) 0.61 (.0005)^{^d} 1 
Flanker^{^b} 0.01 (.95) 0.26 (.18) 0.23 (.23) 1 
Stroop^{^c} 0.07 (.74) −0.08 (.68) −0.02 (.94) 0.03 (.90) 1
↵a Using estimates for missing EDSS scores.
↵b For the Flanker task, 1 participant performed below chance (n = 28).
↵c For the Stroop task, data for 1 participant were lost, and 1 performed below chance (n = 27).
↵d Statistically significant at P < .05.

	Age	Duration	EDSS	Flanker	Stroop
Age	1
Duration	0.36 (.06)	1
EDSS^{^a}	0.30 (.11)	0.61 (.0005)^{^d}	1
Flanker^{^b}	0.01 (.95)	0.26 (.18)	0.23 (.23)	1
Stroop^{^c}	0.07 (.74)	−0.08 (.68)	−0.02 (.94)	0.03 (.90)	1